(19)
(11) EP 0 321 888 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
29.08.1990 Bulletin 1990/35

(43) Date of publication A2:
28.06.1989 Bulletin 1989/26

(21) Application number: 88121171.8

(22) Date of filing: 17.12.1988
(51) International Patent Classification (IPC)4: G01N 3/36, G01R 31/02
(84) Designated Contracting States:
DE FR GB IT NL

(30) Priority: 23.12.1987 US 137098

(71) Applicant: E.I. DU PONT DE NEMOURS AND COMPANY
Wilmington Delaware 19898 (US)

(72) Inventor:
  • Vassiliou, Eustathios
    Newark Delaware 19711 (US)

(74) Representative: von Kreisler, Alek, Dipl.-Chem. et al
Patentanwälte von Kreisler-Selting-Werner Postfach 10 22 41
50462 Köln
50462 Köln (DE)


(56) References cited: : 
   
       


    (54) Method and apparatus for detecting and eliminating entrapped gas bubbles in a thick film coating


    (57) An entrapped gas bubble in a thick film coating of a member is caused to pulsate when the ambient pressure of the chamber in which the member is disposed is varied. The pulsations may be used to observe the bubble or to cause it to burst.







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